Does this work when the engine is off but the car battery is still on?
33793
It will work as long as ur power point works if it works without the engine then this will work also
33794
Yes, as long as the car's accessory power port (a.k.a. Cigarette lighter!) is powered, the supply runs. I have a smaller Bestek that is fairly noisy for a while after starting, this one is pretty quiet.
370690
Are u asking with a system running with the engine off or the battery just sitting there not being used in the car?
1245148
This device contains no battery. It obtains power from the same OBD-II socket that provides data about speed, RPMs, etc. As noted elsewhere, in most cars this means the device turns on and off automatically when you start and stop the car with the car's ignition switch. In a few cars, the OBD-II socket provides power even when the ignition switch is off, so you would need to plug and unplug this device each time you use the car, which would probably wear out the unit's harness rapidly.
2116749
Yep, it'll work. Also contrary to other comments, it doesn't drain your car battery if you leave it plugged in.
922835
Yes it does and works fine. But keep your car running because it may run down your battery otherwise.
45862
it will only work if u left your lights in and the battery is too low to start. If there is anything else wrong such as the starter, alternator etc it doesn't work
184194
No. It works while still in the vehicle. I used it on my lawn mower and jet ski and it works well.
692508
I guess it depends on whether or not your vehicle sends power to it when turned off. My Nissan does not, but my Jeep does. I leave them plugged in in both and so far have had no issues.
1186409
As in "If your car battery gets low will this shut down?" If that's what you mean then no, it doesn't. If the device doesn't receive the charge it needs to run, however, it will shut down. Your car battery won't drain with this turned on as long as your engine's running, thus, keeping your car's battery charged.
1928154
No it doesn't. Your vehicle needs to be running to charge the battery. You may use it with your vehicle off but not for too long
880180
Garry - i'm not 100% positive (like 75%), but pretty sure that the OBDII comm shuts down shortly after most cars are turned off & I believe that this device (powered by OBDii) will also shut-off and thus not drain the battery.
303182
not many cars power plugs work with engine off so no risk of draining battery , power cord usually plugged in and used by someone in the car while driving
26011
Nope. The car needs a power outlet that stays on all the time. Just about all recent cars [at most 1999 to present] have an always on power outlet although it may take a while to find it.
2266388
If I understand your question correctly, no. If your car battery is really old and totally bad and incapable of holding a charge, I don't think this will work. It works great for a still good battery that has drained down due to leaving something on or something of that nature.
1259437
Hi. I am not sure. When I turn off my car everything is off including power.
1557829
It probably will. Most cars will turn off the power to 12v socket when car is turned off. In that case there is no problem.
2038844
Are you sure your 12 V power doesn't turn off when you turn off the ignition? Most cars turn off the power when the ignition is off. If yours does stay on it be ok if you drive it regularly, if it is off for a long time it could drain the battery because it would continue to draw a little of power.